Little headup to tell you the template Derivatives is obsolete, Bunai changed it to Derivative instead. Clearly, replace the yt_id by links = yt (same for all other platforms), add a "s" to "singer", replace "author" by "producers" and "category" by "categories".
Normally the full documentation is on the template's page itself. I guess there was a little communication issue and you are the only admin who isn't aware about the change ^^"
I would have told you to ask Bunai for more info, but since she is in pause, you can ask to Viper or Meerkat instead, who are pretty active :)
At least now you are aware :D Also please be careful, we changed as well the formatting for producers and albums's pages, just in case ;)